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Date:      Thu, 18 Jan 2001 20:15:41 +1000
From:      "Doug Young" <dougy@bryden.apana.org.au>
To:        "Ted Mittelstaedt" <tedm@toybox.placo.com>, "'Darren Henderson'" <darren@bmv.state.me.us>, <freebsd-questions@FreeBSD.ORG>
Subject:   Re: pppd, modem, app oddity
Message-ID:  <002001c08137$a86eec40$847e03cb@apana.org.au>
References:  <004701c08135$47355060$1401a8c0@tedm.placo.com>

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Does the W2K machine have internet connection sharing enabled ??
I've had more than my share of totally weird issues that defy logical
explanation
with that beast in W2K, WinME & Win98SE. Generally if you remove the
ICS listing in Control Panel & reboot it fixes most of the problem

----- Original Message -----
From: "Ted Mittelstaedt" <tedm@toybox.placo.com>
To: "'Darren Henderson'" <darren@bmv.state.me.us>;
<freebsd-questions@FreeBSD.ORG>
Sent: Thursday, January 18, 2001 7:58 PM
Subject: RE: pppd, modem, app oddity


>
> >-----Original Message-----
> >From: owner-freebsd-questions@FreeBSD.ORG
> >[mailto:owner-freebsd-questions@FreeBSD.ORG]On Behalf Of Darren
> >Henderson
> >Sent: Wednesday, January 17, 2001 8:55 AM
> >To: freebsd-questions@FreeBSD.ORG
> >Subject: pppd, modem, app oddity
> >
> >
> >
> >I've never seen anything quite like this one, curious if
> >anyone else has and
> >if they have found a work around. I have an application
> >running on a machine
> >behind the firewall that is causing the modem used by the firewall to
> >connect to my ISP to go into retrain.
> >
> >I have a freebsd 4.2-stable machine acting as a firewall and
> >masquarading
> >for the machines behind it. It connects to my ISP via a USR
> >v.everything
> >modem using pppd. Everything works great, no problems with
> >this set up or
> >past incarnations of it for the last 4 years.
> >
> >Inside the firewall there are a number of windows machines and
> >macs. They
> >have no problems doing what they need to do (other then
> >bandwidth - ISDN
> >coming in a few weeks hopefully). Quake 3 Team Arena was
> >recently installed
> >on a W2K machine. When that machine attempts to connect to a
> >quake server
> >outside my network, more often then not, will apparently hang
> >after its set
> >up. What is actually occuring is that it gets to the same
> >portion of the set
> >up (just after the snapshot, usually when switcing to a new
> >map), and the
> >modem on the firewall goes into retrain, and stays there, until the w2k
> >machine is told to end the game, at which point the firewall
> >modem drops out
> >of retrain and continues on like nothing happened.
> >
>
> Hmmm - what are your modem settings and ppp settings?
>
> >I am a bit suprised that an application, one not even on the
> >firewall, can
> >cause the modem on the firewall to behave this way. There must
> >be something
> >in the traffic or some characteristic of the traffic generated that is
> >causing the modem fits.
>
> That's the first thing that you would of course look for.  However, before
> doing that check the compression settings on the modem and on the PPP
> setup.  If the ppp IS negotiating compression, then if you think about it
> for a second you will see that any control characters or anything in the
> data stream that would resemble an escape sequence, it would be compressed
> before being passed to the modem, so that character sequence wouldn't
> exist in the modem data stream.
>
> The settings that you SHOULD have in this is compression turned OFF on the
> modem,
> and error control turned ON on the modem.  The ppp software should
> definitely
> have compression negotiated.
>
>  Anyone seen this kind of behavior
> >before? Is there a
> >way to keep it from happening? Rather nebulous I know. I need to get a
> >sniffer on the line and see whats going on, though that may
> >not help if the
> >cause is contained in the inbound traffic it would never get
> >to a level I
> >can observe.
> >
>
> Ted Mittelstaedt                      tedm@toybox.placo.com
> Author of:          The FreeBSD Corporate Networker's Guide
> Book website:         http://www.freebsd-corp-net-guide.com
>
>
>
>
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